Perovskite-structured LaCoO3 modified ZnO gas sensor and investigation on its gas sensing mechanism by first principle

Qin, Wenbo; Yuan, Zhenyu; Gao, Hongliang; Zhang, Renze; Meng, Fanli

doi:10.1016/j.snb.2021.130015

Cited by 162 publications

(60 citation statements)

References 68 publications

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“…The crystalline structure of the synthesized catalyst materials was investigated by X-ray diffractometer as shown in Figure 2. It was found that the Ni/Co-La2O3 and Ni/Mn-La2O3 catalysts showed the perovskite structure of LaCoO3 and LaM-nO3, respectively [41,42]. This confirmed that the FSP method can be an efficient way to produce the perovskite-structure material.…”

Section: The Roles Of Transition Metal In the Nibased Catalystsmentioning

confidence: 68%

The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

Aunmunkong

Chaisuk

2021

Bull. Chem. React. Eng. Catal.

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The transition metal (Co, Mn, Cu or Zn) doped La2O3 material was prepared by flame spray pyrolysis (FSP) technique. The 2 wt.% Ni catalyst supported on this material was characterized by XRD, N2 physisorption, TPR, H2 chemisorption and TGA, and evaluated by the dry reforming of methane (DRM). The perovskite structure was certainly formed when either Co or Mn was introduced. The Cu can generate the La2CuO4 spinel phase while the Zn showed a mixed phase of La2O3, ZnO and La(OH)3. The Ni/Co-La2O3 catalyst was more active for the DRM because of high amount of active dual sites of Ni and Co metals dispersed on the catalyst surface. The formation of La2O2CO3 during the reaction can inhibit the coke formation. The cooperation of La2O2CO3 and MnO phases in the Ni/Mn-La2O3 catalyst was promotional effect to decrease carbon deposits on the catalyst surface. The partial substitution of Co for Mn with a small content of Mn can enhance the catalytic activity and the product yield. The Ni/Mn0.05Co0.95-La2O3 catalyst showed the highest CH4 conversion, H2 yield and H2/CO ratio. The Mn inserted into the perovskite structure of LaCoO3 was an important player to change oxygen mobility within the crystal lattice to maintain a high performance of the catalyst. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Section: The Roles Of Transition Metal In the Nibased Catalystsmentioning

confidence: 68%

The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

Aunmunkong

Chaisuk

2021

Bull. Chem. React. Eng. Catal.

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“…Li et al fabricated ZnSe/ZnO heterostructures to achieve improved sensitivity through the accumulation of transferred electrons between heterointerfaces . Hence, it is no doubt that rational design shared heterostructures might contribute to the improvement of performance for gas sensors. , …”

Section: Introductionmentioning

confidence: 99%

A Sensitive Acetone Sensor Based on WS₂/WO₃ Nanosheets with p-n Heterojunctions

Liu

Cheng

et al. 2022

ACS Appl. Nano Mater.

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Gas sensors based on heterojunctions have attracted extensive attention because of their high sensitivities over monolithic metal oxide. However, it is difficult to obtain homogeneous and stable heterojunctions by traditional synthesis methods. Herein, we proposed an in situ oxidation technique to fabricate WS2/WO3 nanosheets with p-n heterojunctions in a convenient and controllable manner. Through this method, the ratio of WS2/WO3 can be effectively regulated by adjusting the oxidant concentration and oxidation time. The obtained WS2/WO3 nanosheets were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), etc. Then, a gas sensor based on WS2/WO3-4 heterojunctions was constructed to detect acetone in a wide range of 20–500 ppm. It was also found that the WS2/WO3-4-based sensor exhibited excellent repeatability, selectivity, and long-term stability for acetone determination. The sensitivity of the sensor toward 100 ppm acetone was 3.5, which was much higher than that of pure WO3. The results indicated that construction of heterojunctions could be therefore considered as a favorable method for improving the sensitivity of the prepared gas sensor. Moreover, this work provides a simple and flexible avenue to synthesize heterojunctions with high structural homogeneity for applications in various fields.

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“…In addition, ethanol sensors also play an important role in detecting drunk driving [7]. Currently, gas detection technology includes gas chromatography [8], quartz crystal microbalance [9], and TDLAS detection technology [10]. However, real-time monitoring of ethanol is achieved by chemiresistive sensors with the advantages of easy preparation, low cost, and portability [11,12].…”

Section: Introductionmentioning

confidence: 99%

NiO-Based Gas Sensors for Ethanol Detection: Recent Progress

Zeng

2022

Journal of Sensors

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In this review, we summarized the state-of-the-art progress on the ethanol performance of NiO by means of morphology, doping, loading noble metal particles, and forming heterojunctions. We first introduced the effect of modulating NiO morphology on ethanol performance that has been reported in recent years. The morphology with large specific surface area and high porosity was considered to be the one that can bring high gas response. Then, we discussed the enhanced effect of the doping of metal cations and noble metal particle loading on the ethanol-sensitive properties of NiO. Doping ions increased the ground-state resistance and increased the oxygen defect concentration of NiO. The effects of noble metal particles on the performance of NiO included chemical sensitization and electronic sensitization. Finally, the related contents of NiO forming complexes with metal oxides and bimetallic oxides were discussed. In this section, the specific improvement mechanism was discussed first, and then, the related work of researchers in recent years was summarized. At the same time, we presented a reasonable outlook for NiO-based ethanol sensors, imagining future directions.

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Perovskite-structured LaCoO3 modified ZnO gas sensor and investigation on its gas sensing mechanism by first principle

Cited by 162 publications

References 68 publications

The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

A Sensitive Acetone Sensor Based on WS₂/WO₃ Nanosheets with p-n Heterojunctions

NiO-Based Gas Sensors for Ethanol Detection: Recent Progress

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Perovskite-structured LaCoO3 modified ZnO gas sensor and investigation on its gas sensing mechanism by first principle

Cited by 162 publications

References 68 publications

The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

A Sensitive Acetone Sensor Based on WS2/WO3 Nanosheets with p-n Heterojunctions

NiO-Based Gas Sensors for Ethanol Detection: Recent Progress

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A Sensitive Acetone Sensor Based on WS₂/WO₃ Nanosheets with p-n Heterojunctions